Thermal Properties of Matter Recap

What happens when ice melts?

• The average kinetic energy of the particles in ice increases.

• The average potential energy of the particles in ice remains constant.

• The average thermal energy of the particles in ice remains constant.

• The average internal energy of the ice increases.

Liquid X and Y having the same mass and initial temperature are heated up by two identical heaters. The temperature of liquid X increases faster than liquid Y.

Assuming no heat is lost to the surroundings , which statement best explains the observation?

• Liquid X has a higher specific heat capacity than liquid Y

• Liquid X has lower melting point than liquid Y

• Liquid X has lower specific heat capacity than liquid Y

• Liquid X has a lower density than liquid Y

• 0.4

• 320

• 400

• 4000

An experiment is conducted to find out the specific heat capacity of an unknown liquid X. The following data are obtained.

Initial Temperature of X:  25°C

Final Temperature of X:  96°C

Mass of substance X: 1.8 kg

Electrical power rating of heater: 800 W

Duration of heating: 5 mins

What is the specific heat capacity of liquid X?

• 1.88 J/(kg °C)

• 31.3 J/(kg °C)

• 1880 J/(kg °C)

• 1390 J/(kg °C)

Four different liquids W, X, Y and Z are originally at room temperature. They are all being heated up using four identical heaters. The temperature-time graph of the 4 liquids are being plotted as shown.

Which of the following ranks the value of the specific heat capacities of the four liquids in increasing order?

• Z, Y, X, W

• W, X, Y, Z

• Z, X, W, Y

• Y, W, X, Z